An addict develops delusion, misleading hallucination of sight and hearing and the feeling of creeping things of “grains of sand” in the skin, he is addicted to :
**Core Concept**
Delusional parasitosis, also known as Ekbom's syndrome, is a psychiatric disorder characterized by a false belief of being infested with parasites or tiny insects. This condition is often associated with substance abuse, particularly with the use of central nervous system (CNS) stimulants.
**Why the Correct Answer is Right**
The delusional parasitosis in this addict is likely caused by the chronic use of CNS stimulants, which can lead to a state of hyperarousal and altered perception. The "creeping things of 'grains of sand' in the skin" is a classic description of formication, a tactile hallucination that can occur in individuals under the influence of stimulants like cocaine or amphetamines. The misuse of these substances can lead to a disruption in the normal functioning of the brain's reward system, resulting in the development of delusions and hallucinations.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not describe a common substance associated with delusional parasitosis.
**Option B:** This option is incorrect because it refers to a different type of hallucination, not related to the sensation of being infested with parasites.
**Option C:** This option is incorrect because it describes a different type of hallucination, not related to the sensation of being infested with parasites.
**Clinical Pearl / High-Yield Fact**
Delusional parasitosis is often associated with the use of CNS stimulants and can be a sign of underlying substance use disorder. It is essential to consider this condition in the differential diagnosis of patients presenting with delusions and hallucinations.
**Correct Answer:** C. Cocaine (or amphetamines)